| 摘要 |
FIELD: radio engineering. SUBSTANCE: device has series-connected low-frequency signal generator, controlled selector switch, amplitude modulator whose signal input is connected to signal generator and output, to matching unit whose output functions as input of receiver under check. Comparison unit is connected to the latter and to reference- signal shaper. Second controlled selector switch, amplifier, third controlled selector switch, display unit, controlled generator, and second amplitude modulator are connected in series; input of second amplitude modulator is connected to first controlled selector switch. Controlled attenuator is connected to second selector switch and to electronic switch which is connected to threshold element and to matching unit. Series-interconnected are differentiating unit and complementing flip-flop which is connected to first, second, and third selector switches. Frequency detector input functions as output of intermediate- frequency amplifier of receiver under check. Frequency detector output is connected to valve and the latter is connected to inverter and to OR gate whose second output is connected to threshold element output. EFFECT: provision for eliminating overloading of receiver under check and for detecting spurious- signal receiving channels. 2 dwg
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